21200000020111 has 16 divisors (see below), whose sum is σ = 23332329715968. Its totient is φ = 19101852201600.

The previous prime is 21200000020081. The next prime is 21200000020201. The reversal of 21200000020111 is 11102000000212.

It is a cyclic number.

It is not a de Polignac number, because 21200000020111 - 2⁹ = 21200000019599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200000020211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105513616 + ... + 105714346.

It is an arithmetic number, because the mean of its divisors is an integer number (1458270607248).

Almost surely, 2^{21200000020111} is an apocalyptic number.

21200000020111 is a deficient number, since it is larger than the sum of its proper divisors (2132329695857).

21200000020111 is a wasteful number, since it uses less digits than its factorization.

21200000020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285822.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21200000020111 its reverse (11102000000212), we get a palindrome (32302000020323).

It can be divided in two parts, 212000000201 and 11, that added together give a palindrome (212000000212).

The spelling of 21200000020111 in words is "twenty-one trillion, two hundred billion, twenty thousand, one hundred eleven".